Add ChilliCream UnsignedShort scalar (#61)

Author: glen-84

scalars/contributed/chillicream/unsigned-short.md

@@ -0,0 +1,102 @@
+# UnsignedShort — GraphQL Custom Scalar
+
+Author – ChilliCream
+
+Date – 2026-01-09
+
+**License and Copyright**
+
+Copyright © GraphQL contributors. This specification is licensed under
+[OWFa 1.0](https://www.openwebfoundation.org/the-agreements/the-owf-1-0-agreements-granted-claims/owfa-1-0).
+
+# Overview
+
+The `UnsignedShort` scalar type represents an unsigned 16-bit integer. It is
+intended for scenarios where values are constrained to the range 0 to 65,535,
+such as representing port numbers, small counts, or other non-negative values
+that fit within 16 bits.
+
+Unlike the `Short` scalar which represents signed 16-bit integers with a range
+of -32,768 to 32,767, `UnsignedShort` provides stronger type safety for values
+that must be non-negative and can represent larger positive values.
+
+# Recommended name
+
+The recommended name for this scalar is `UnsignedShort`.
+
+# Result spec
+
+An `UnsignedShort` scalar must serialize to an integer value in the range 0 to
+65,535 (inclusive).
+
+## Examples
+
+These are valid result values:
+
+| Value   | Explanation                   |
+| ------- | ----------------------------- |
+| `0`     | Minimum unsigned short value. |
+| `65535` | Maximum unsigned short value. |
+| `8080`  | A common port number.         |
+
+These are invalid result values:
+
+| Value    | Why is it invalid                     |
+| -------- | ------------------------------------- |
+| `-1`     | Negative values are not allowed.      |
+| `65536`  | Exceeds maximum unsigned short value. |
+| `3.14`   | Fractional values are not allowed.    |
+| `"8080"` | Must be a number, not a string.       |
+
+# Input spec
+
+An `UnsignedShort` scalar accepts integer values in the range 0 to 65,535
+(inclusive), both as GraphQL literals and as JSON input values.
+
+Implementations should validate:
+
+- Value is an integer (no fractional component)
+- Value is between 0 and 65,535 (inclusive)
+- Value is not negative
+
+## Examples
+
+Valid input values:
+
+GraphQL Literal:
+
+```graphql
+query {
+  serviceStatus(port: 8080) {
+    status
+  }
+}
+```
+
+JSON input:
+
+```json
+{
+  "port": 8080
+}
+```
+
+```json
+{
+  "maxConnections": 65535
+}
+```
+
+Invalid input values:
+
+| Value    | Why is it invalid                     |
+| -------- | ------------------------------------- |
+| `-1`     | Negative values are not allowed.      |
+| `65536`  | Exceeds maximum unsigned short value. |
+| `3.14`   | Fractional values are not allowed.    |
+| `"8080"` | Must be a number, not a string.       |
+
+# References
+
+- [GraphQL Specification - Int](https://spec.graphql.org/September2025/#sec-Int)
+  — Built-in integer scalar type